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Pipelines Welding Handbook

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Pipelines Welding Handbook ã Welding techniques ã Welding consumables ã Defects and remedies XA00105920 List of contents INTRODUCTION .............................................. Joint details ............................................................. Joint types ............................................................... Electrode positioning angles ................................... Pipe classification ................................................... Consumption of electrodes .
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  Pipelines Welding Handbook  ã Welding techniques ã Welding consumables ã Defects and remedies  XA00105920  INTRODUCTION  ..............................................3Joint details .............................................................4Joint types ...............................................................5Electrode positioning angles ...................................6Pipe classification ...................................................7Consumption of electrodes .....................................11ASME / EN positions ..............................................13 THE MANUAL METAL ARC PROCESS  ...........................................................15 General information  ..............................................16Filler materials ........................................................17Pipeweld cellulosic electrodes ................................17Basic electrodes ......................................................19Basic electrodes - Technical data............................20Cellulosic electrodes - Technical data..................... 22 WELDING TECHNIQUES AND OPERATIVE PRACTICES  .................25 General information  ..............................................26 Pipe welding in vertical down (downhill)with cellulosic electrodes 1 - Preparation and tacking .....................................272 - Joint in 5G/PG position ......................................293 - Joint in 6G/H-L045 position ...............................35 Welding of pipes in vertical up (uphill)with mixed cellulosic/basic technique 1 - Preparation and tacking .....................................382 - Joint in 5G/PF position ......................................403 - Joint in 2G/PC position ......................................444 - Joint in 6G/H-L045 position .............................. 47 DEFECTS: CAUSESAND REMEDIES  ......49 AUTOMATIC PIPE WELDING  ....................53 General information  ..............................................54Filler materials ........................................................55Welding techniques and operational practices .......57Examples of WPS ...................................................58Comparison between three welding methods..........62Defects and remedies .............................................63 List of contents  1  INTRODUCTION  Butt Joint 1.Root gap:separation between the edges to be weldedat the root of the joint2.Root face:surface of the joint preparationperpendicular to the surface of the plate3.Bevel surface:oblique surface of the joint preparation4.Bevel angle:angle between the bevelled surface anda plane perpendicular to the plate5.Included angle:total angle between the two bevelsurfaces6.Seam width:effective width of the joint (distancebetween the bevels plus depth of penetration).Thewidth of the calking iron seam and groove iron are thesame thing7.Thickness of the plate F illet Joint 1.Throat thickness:distance between seam root andsurface measured on the bisector of the angle2.Leg lenght:distance between seam root and edge3.Joint root:point in which the bottom of the seamintersects the surface of the base metal4.Joint edge:junction point between seam surface andbase metal surface5.Joint surface:external surface of the seam6.Fusion depth:depth reached by the fusion bath fromthe surface of the base metal7.Seam width:distance between the joint edges Joint details  4
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